Autodesk Exchange Apps is an online resource where you can browse and purchase Apps (including product-specific content such as models, training materials, and eBooks) – and is available to several Autodesk Products. You can download some items for free, and some for a price. Purchasing is handled via PayPal at this time. Purchases and downloads can be tracked online, or by using the Autodesk Exchange App Manager that is included with the respective Autodesk product.
Access the Autodesk Exchange Apps website here: http://apps.exchange.autodesk.com/